Rotational Motion (NEET Physics): Questions 36 - 40 of 123

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Question number: 36

» Rotational Motion » Torque

MCQ▾

Question

A wheel having moment of inertia 5 kg -m 2 about its vertical axis, rotates at the rate of 60 rpm about this axis. The torque which can stop the wheel’s rotation in 1 minute would be

Choices

Choice (4) Response
a.

π15Nm

b.

2 π 15 N m

c.

π18Nm

d.

π6Nm

Question number: 37

» Rotational Motion » Angular Momentum

MCQ▾

Question

A round disc of moment of inertia I 2 about its axis perpendicular to its plane and passing through its center is placed over another disc of moment of inertia I1 rotating with an angular velocity co about the same axis. The final angular velocity of the combination of discs is

Choices

Choice (4) Response
a.

(I1+I2)ωI1

b.

ω

c.

I1ω(I1+I2)

d.

I2ω(I1+I2)

Question number: 38

» Rotational Motion » Angular Momentum

MCQ▾

Question

The wheel of a car is rotating at the rate of 1200 revolutions per minute. On pressing the accelerator for 10 seconds, it starts rotating at 4500 revolutions per minute. The angular acceleration of the wheel is

Choices

Choice (4) Response
a.

1980 degree/sec 2

b.

40 rad/sec 2

c.

30 rad/sec 2

d.

1880 degree/sec 2

Question number: 39

» Rotational Motion » Torque

MCQ▾

Question

An automobile engine develops 100 kW when rotating at a speed of 1500 rev/min. What torque does it deliver?

Choices

Choice (4) Response
a.

531 N-m

b.

637 N-m

c.

440 N-m

d.

350 N-m

Question number: 40

» Rotational Motion » Torque

MCQ▾

Question

A torque of 20 N-m is applied on a 5 kg wheel whose moment of inertia is 2kg-m 2 for 10 sec. The angle covers by the wheel in 10 sec will be

Choices

Choice (4) Response
a.

3000 rad

b.

500 rad

c.

750 rad

d.

6000 rad

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